The Basilica is within Italian territory and not the territory of the Vatican City State.[1] However, the Holy See fully owns the Basilica, and Italy is legally obligated to recognize its full ownership thereof[2] and to concede to it "the immunity granted by International Law to the headquarters of the diplomatic agents of foreign States".[3]

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The Basilica was founded by the Roman Emperor Constantine I over the burial place of St. Paul, where it was said that, after the Apostle's execution, his followers erected a memorial, called a cella memoriae. This first edifice was expanded under Valentinian I in the 370s.

In 386, Emperor Theodosius I began erecting a much larger and more beautiful basilica with a nave and four aisles with a transept; the work including the mosaics was not completed until Leo I's pontificate (440–461). In the 5th century it was larger than the Old St. Peter's Basilica. The Christian poet Prudentius, who saw it at the time of emperor Honorius (395–423), describes the splendours of the monument in a few expressive lines. As it was dedicated also to Saints Taurinus and Herculanus, martyrs of Ostia in the 3rd century,[4] it was called the basilica trium Dominorum ("basilica of Three Lords").

Under Pope St. Gregory the Great (590–604) the Basilica was extensively modified. The pavement was raised to place the altar directly over St. Paul's tomb. A confession permitted access to the Apostle's sepulcher.

In that period there were two monasteries near the Basilica: St. Aristus's for men and St. Stefano's for women. Masses were celebrated by a special body of clerics instituted by Pope Simplicius. Over time the monasteries and the Basilica's clergy declined; Pope St. Gregory II restored the former and entrusted the monks with the Basilica's care.

As it lay outside the Aurelian Walls, the Basilica was damaged in the 9th century during a Saracen raid. Consequently, Pope John VIII (872–82) fortified the Basilica, the monastery, and the dwellings of the peasantry, forming the town of Joannispolis (Italian: Giovannipoli) which existed until 1348, when an earthquake totally destroyed it.

On 15 July 1823, a negligent workman repairing the lead of the roof, started a fire that led to the near total destruction of this basilica, which, alone among all the churches of Rome, had preserved its primitive character for 1435 years.

Pope Leo XII issued a document Ad plurimas encouraging donations for reconstruction. It was re-opened in 1840, and reconsecrated in 1855 with the presence of Pope Pius IX and fifty cardinals. The complete decoration and reconstruction, in charge of Luigi Poletti,[6] took longer, however, and many countries made their contributions. The Viceroy of Egypt sent pillars of alabaster, the Emperor of Russia the precious malachite and lapis lazuli of the tabernacle. The work on the principal façade, looking toward the Tiber, was completed by the Italian Government, which declared the church a national monument. On 23 April 1891 the explosion of the gunpowder magazine at Forte Portuense destroyed the stained glass windows.

The covered portico that precedes the façade is a Neo-classicist addition of the 19th-century reconstruction. The 20th-century door includes the remains of the leaves from the original portal, executed by Staurachius of Chios around 1070 in Constantinople, with scenes from the New and Old Testament. On the right is the Holy Door, which is opened only during the Jubilees.

The new basilica has maintained the original structure with one nave and four aisles. It is 131.66 metres (432.0 ft) long, 65 metres (213 ft)-wide, and 29.70 metres (97.4 ft)-high, the second largest in Rome.

The nave's 80 columns and its stucco-decorated ceiling are from the 19th century. All that remains of the ancient basilica are the interior portion of the apse with the triumphal arch. The mosaics of the apse, work by Pietro Cavallini, were mostly lost in the 1823 fire; only a few traces were incorporated in the reconstruction. The 5th-century mosaics of the triumphal arch are original: an inscription in the lower section attest they were done at the time of Leo I, paid by Galla Placidia. The subject portrays the Apocalypse of John, with the bust of Christ in the middle flanked by the 24 doctors of the church, surmounted by the flying symbols of the four Evangelists. St. Peter and St. Paul are portrayed at the right and left of the arch, the latter pointing downwards (probably to his tomb).

In the old basilica each pope had his portrait in a frieze extending above the columns separating the four aisles and naves. A 19th-century version can be seen now. The nave's interior walls were also redecorated with scenes from Saint Paul's life in two mosaics.

South of the transept is the cloister, considered "one of the most beautiful of the Middle Ages".[7] Built by Vassalletto in 1205-1241, it has double columns of different shapes. Some columns have inlays with golden and coloured-glass mosaics; the same decoration can be seen on the architrave and the inner frame of the cloister. Also visible are fragments from the destroyed basilica and ancient sarcophagi, one with scenes of the myth of Apollo.

According to tradition, St. Paul's body was buried two miles away from the place of his martyrdom, in the sepulchral area along the Ostiense Way, which was owned by a Christian woman named Lucina. A tropaeum was erected on it and quickly became a place of veneration.[Notes 2]

Constantine I erected a basilica on the tropaeum's site, and the basilica was significantly extended by Theodosius I from 386, into what is now known as Saint Paul Outside the Walls. During the 4th century, Paul's remains, excluding the head, were moved into a sarcophagus. (According to church tradition the head rests at the Lateran.) Paul's tomb is below a marble tombstone in the Basilica's crypt, at 1.37 metres (4.5 ft) below the altar. The tombstone bears the Latin inscription PAULO APOSTOLO MART ("to Paul the apostle and martyr"). The inscribed portion of the tombstone has three holes, two square and one circular. The circular hole is connected to the tomb by a pipeline, reflecting the Roman custom of pouring perfumes inside the sarcophagus, or to the practice of providing the bones of the dead with libations. The sarcophagus below the tombstone measures 2.55 metres (8.4 ft) long, 1.25 metres (4.1 ft) wide and 0.97 metres (3.2 ft) high.

Front of the Basilica of Saint Paul Outside the Walls

The discovery of the sarcophagus is mentioned in the chronicle of the Benedictine monastery attached to the Basilica, in regard to the 19th century rebuilding. Unlike other sarcophagi found at that time, this was not mentioned in the excavation papers.[8]

On 6 December 2006, it was announced that Vatican archaeologists had confirmed the presence of a white marble sarcophagus beneath the altar, perhaps containing the remains of the Apostle.[9][10] A press conference held on 11 December 2006[11] gave more details of the work of excavation, which lasted from 2002 to 22 September 2006, and which had been initiated after pilgrims to the basilica expressed disappointment that the Apostle's tomb could not be visited or touched during the Jubilee year of 2000.[12] The sarcophagus was not extracted from its position, so that only one of its two narrow sides is visible.[13]

A curved line of bricks indicating the outline of the apse of the Constantinian basilica was discovered immediately to the west of the sarcophagus, showing that the original basilica had its entrance to the east, like Saint Peter's Basilica in the Vatican. The larger 386 basilica that replaced it had the Via Ostiense (the road to Ostia) to the east and so was extended westward, towards the river Tiber, changing the orientation diametrically.

^the earliest account of a visit to the memorials of the apostles is attributed to Gaius, the Presbyter, "who lived when Zephyrinus was bishop of Rome [AD 199–217]", as quoted by Eusebius reporting that "I can point out the tropaia of the Apostles [Peter and Paul]; for if you go to the Vatican or the Ostian Way, you will find the tropaia of those who founded this Church".